hi all
Qt Code: 
  1. if(size==0){
  2.     readD.open(QIODevice::ReadOnly);
  3.     QTextStream foint(&readD);
  4.     foint>>flowtime;
  5.     readD.close();
  6.     for(;;){
  7.         this_thread::sleep_for(chrono::seconds(10));
  8.         time_t now=time(0);
  9.  
  10.           times.open(QIODevice::WriteOnly);
  11.           QTextStream goes(&times),loint(&today);
  12.           goes<<now;
  13.           times.close();
  14.  
  15.               double secs=difftime(now,flowtime);
  16.  
  17.  
  18.               today.open(QIODevice::WriteOnly);
  19.               loint<<secs<<"\n";
  20.               today.close();
  21.  
  22.  
  23.     }
  24. }
  25.     else{
  26.         qDebug()<<"is There";
  27.         readD.open(QIODevice::ReadOnly);
  28.         QTextStream foint(&readD);
  29.         foint>>flowtime;
  30.         readD.close();
  31.         int seci=0;
  32.         for(;;){
  33.  
  34.             this_thread::sleep_for(chrono::seconds(10));
  35.             engine.open(QIODevice::ReadWrite);
  36.             QTextStream eng(&engine);
  37.             eng<<seci;
  38.             engine.close();
  39.             seci+=10;
  40.             if(seci==60){
  41.                 seci=0;
  42.                 today.open(QIODevice::WriteOnly | QIODevice::Append);
  43.                 QTextStream fps(&today);
  44.                 fps<<60<<endl;
  45.                 today.close();
  46.             }
  47.  
  48. }
  49.     }
  50. }
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I Already Check this code The Program Will Enter Else But Only Will Not Print Message That I Write With qDebug Other Codes in Else Will Run Perfectly.